Features 1、It is suitable for all kinds of graduated tubes, droppers, pipettes, pipettors, etc., used to discharge air and absorb liquid. 2、The contour shape and thick‑walled neck increase the grip and make it easier to use with pipettes and syringes. 3、Natural rubber is made by processing and has the characteristics of strong elasticity, soft hand feeling and rapid inflation. 4、The components are tightly connected and airtight; the material is preferred, and the aging resistance is strong. 5、The laboratory suction ball is made of high‑quality rubber, which is non‑toxic, tasteless, safe and durable. Specification Item Type: Suction Ball Material: Rubber Color: Blue Inner Diameter of the Hole: Approx. 6mm / 0.2in Maximum Mouth Diameter: Approx. 12mm / 0.5in Ball Diameter: Approx. 35.5mm / 1.4in Total Ball Length: Approx. 55.5mm / 2.2in Purpose: Suitable for all kinds of graduated tubes, droppers, pipettes, pipettors, etc., used to discharge air and absorb liquid. Package List 10 x Suction Ball